This phenomenon is not really specific to repr(). It occurs with new-style
classes when methods are assigned.
Example:
class A(object):
def __repr__(self):
return 'abc'
>>>a = A()
>>>a.__repr__ = lambda: 'abc'
>>>repr(a)
'abc'
>>>a.__repr__()
'123'
Whenever the method is accessed by Python code it sees the assigned method
in the object's __dict__. Builtins like repr(), iter() etc, see the
original class method. With classic objects both Python and C code see the
assigned function. This is bug #515336 on sourceforge.
Is anyone aware of any other cases where C code and Python code don't see
objects the same way?
Oren
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